Printing-form section.



J. S. DUNCAN. PRINTING FORM SECTION.

APPLICATION FILED mam, 1912.

1,054,285. Patented Feb. 25, 1913 plate wliieh'l 15 been held by the aws of the ct which the following is a specification.

invention is the provision of printing form "Ween j ws which grip the plate at one edge UNITED STATE S PATENT OFFICE.

JGSEIH El. DUNCAN, OF CHICAGO, ILLINOIS, ASSIGNOR T ADDBESSOGRAPH COMPANY,

01 CHICAGO, ILLINOIS. A CORPORATION GTE ILLINOISI PRINTING-FORM SECTION.

Specification oi Letters Patent. Patentgd Feb 25, 1313 Application filed. March 23, 1912. Serial No. 685,816.

ing can be produced from printing characters which are stamped up from sheet-metal. it has heretofore been impracticable to produce a printing form from sheet-metal large. enough to print an entire page at one operation for the reason that the sheet-metal blank was so large that it could not be readily provided with the stamped up printing characters and also because one wrong character on a blank would render the whole form valuelcss.

My present invention aims toward the provision of a printing form which shall be composed of a number of printing form sections each provided with several lines of stamped up printing characters. Should One of these sections be provided with the wrong character during the stamping up operation this section can be discarded and a new one made without destroying the whole form. ,l' urthermore, the individual sections can be readily handled and can be easily provided with the desired printing characters by the graphotypc and other similar machines already in existence.

From the drawings it will be observed that the form sect. on 5 which is preferably made of sheet-metal is provided at one edge To all whom it may concern lie it known that I, Josizrn. S. DUNCAN, a citizen of the United States, residing at Chiin the county of Cook and State of lib-- s. have invented certain new and useful l nip rtirements in Printii'ig Form Sections,

This invention relates to printing form sections adapted for en'iploymcnt as the units of a. sectional printing form such as einistitutes the subject matter of a copendingapplication Serial No. (385,815, filed Maren 23, 1912.

One of the primary objects of the present sections having printing characters stamped up therefrom in close simulation of typewriting characters and adapted to be assembled in juxtaposition upon a suitable -l'orm bed to produce a printing form having a uniform printing surface.

in. st ai'nping up printing characters in a metal plate by means of a graphotypoand other similar machines, the plate is held. be-

thereof, and therefore it will be apparent that printing 'characters cannot be stamped along that portion of the plate which is gripped by the ,.lhat portion of the printing plate which has been gripped by the jaws will of course space the bottom line of type on that plate at too great an interval from the line of type at the top oi the next heiow plate, and therefore it is an important; ob ect of the present invention to provide for wenie tly removing that portion of the .lormed by bending over the edge of the metal blank. This flange I term a retaining tlange as it is provided for the purpose of cooperating with a groove in a form bed to retain the toim section in its proper position on the bed and z'gainst movement longitudinally of the lltitl. It is desirable, of course, that the li'nel. of printing characters throughout the entire printing form be spaced equidistant and it, illfil'ttl fll't-i becomes necessary to place the lines of characters on each form section quite close to the edges. The graphotype and other similar machines which are used to stamp up the printing characters from sheet-metal blanks are equipped with holding jaws between which the metal blank being operated upon is held, suitable mechanism being provided for feeding these jaws along a predetermined distance between the formation of each successive character. A pair of these jaws is indicated on the drawings by reference character 7 audit will be manifest that a line of print ing characters can not be formed very close punching or etalnping machine.

invention will be readily understood cm. the :t'ollowing description when considd in connection with the accompanying rings illustrating one preferred embodiment thereof.

Referring to the drawings--l1igure 1 a perspective view of a pl'li'l'tlllgtffil'lll. section embodying my invention; Fig. 2 is a similar view with the teu'iporary extension of the s .tion rennwed; big. it is an end elevation. ot a term section showing a fragment of the jaws which hold the sections in the typograph; and Fig. l is a view showing the manner of removing the temporary extensions from the sections.

It: is well known to those familiar withv the art that a very close simulation of typewrite. ti

between these jaws.

with a downwardly extending flange (3.

to the edge of the metal blank that is held For the purpose of having the printing characters formed as near the edge of the form section as is required to produce'the proper spacing between the lines of adjacent sections, I prefer to break off that portion of the blank which is held between the jaws 7 during the formation of the characters on the sections and, tothis end, Iscore or weaken each sectiona short distance' from its edge along the line. indicated by reference character 8. The portion-beyond the score line forms, therefore, merely a temporary extension which maybe gripped by the jaws during the formation of the printing characters and can be subsequently broken oil and discarded, leaving the outermost line of printing chafaoters close to the edge of the form section. I

The form sections are preferably scored to weaken them-at the required distance at one groove in any suitable member 10 whereupon. a slight movement of the section between the positions shown in full and in dotted lines in Fig. i will-suflice to break the metal along the weakened line 8, thereby leaving the outermost line of printing characters the required distance from the edge of the section.

While I have shown but one printing section in the present application it will be understood that as many of these sections as are required to produce the vdesired printing form may be made in a similar manner and that when these sections are all assembled, as disclosed in my aforementioned application, a printing form of the desired size having printing characters struck lip-from sheet-metal is produced.

nosaaes It is believed that my invention will be understood from the foregoing without further description and it will beobvious that considerable variation in the details of construction may be resorted to within the scope of the following claims. I

-1. A blank for a section; of a printing plate having a weakened portion extending from end to end thereof adjacent one edge of thehlank, said weakened portion dividing the-blank into a section for'containmg the. punched up printing characters, and a section to be gripped bythe holding, jaws of the punching machine, the weakened portion serving to permit of the last mentioned section being broken off preparatory tofitting the stamped section in a printing form.

2. A blank for a section of a printing plate provided at one edge with a flange,

and also provided with a weakened portion extendingfrom end to end of the blank adjacent the opposite edge thereof, said weakened portion dividing the blank into a sec- -t1on lying between the weakened portion and the flange for containing the punchedup'printi l'ig characters, and another section at the other side-of the weakened portion to be gripped by the holding jaws of the punching machine, the weakened portion serving to permit of said other section being broken oif preparatory to fitting the stamped section in a printing form.

3. A printing plate section having a flange at one edge, and a weakened line adjacent the opposite edge of the plate in s 'ibstantial parallelism with said edge and extending from end to end of the plate,

there being lines of type stamped up in the plate portion between the flange and the weakened line, and the plate portion between the weakened line and the adjacent edge of the plate being blank, the weakened line serving to permit of the blank portion being broken off preparatory to fitting the stamped portion in a printing form.

, JOSEPH S. DUNCAN.

Witnesses V31; 0. BELT, In J. lViLsoN. 

